#include<stdio.h>
#include<string.h>
#include<unistd.h>



int main()
{
    // C
    printf(" hello printf\n");
    fprintf(stdout," hello fprintf ");
    const char* message = " hello fwrite ";
    fwrite(message,1,strlen(message),stdout);

    // system
    const char* w = " hello write\n ";
    write(1,w,strlen(w));

    fork();

    return 0;
}
